Chuck Harris wrote:
Scott Dorsey wrote:
Chuck Harris wrote:
But that is exactly backwards from the way chokes work. As the current
rises, and the core approaches saturation, the coil starts to lose the inductance
enhancement provided by the core, and it approaches the inductance of an
equivalent air core choke. That is, the inductance *drops*, and the inductive
reactance *drops* and the AC current shoots way up.

That makes perfect sense to me. So how _do_ current-limiting chokes work,
then? I always assumed they worked as I described but I may well be wrong.

On DC, they can't! No way, no how.

Right, but I was thinking that in the position where that coil is in
the circuit, it's directly in series with the AC coming off the transformer.

On AC, a choke can limit the current by being a reactive component...
kind of a lossless resistor for AC.

But! Swinging chokes always reduce their inductance when the current
rises. They typically have a 100:1 change in inductance over their
design current range.

How does the reduced inductance translate to higher series impedance?
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."